Hey Andrea, long time no see. :-) Looking at what you were trying to do, I see that you're running against an el6 kernel, and these artifacts weren't compiled against that nor tested against that. We are working to get support for RHEL6/CentOS6 in the final product, but don't have artifacts for that testing yet.

Sadly I don't have more information to offer, as I have never tried to install the RHEL5 artifact on RHEL6 before.

Just to be clear, CentOS6 and RHEL6 are *not yet* supported platforms. When we have an artifact for RHEL6 I think that a number of these requirements will cease to be an issue. In the meantime I would ask that, for the bug hunt, you please use CentOS5 machines with the CentOS5 artifacts.